mcjoin is a simple and easy-to-use tool to test IP multicast,
featuring:

    *   a multicast generator (server)
    *   a multicast data sink (client)
    *   supports joining/sending to one or more groups:
        *   ASM (*,G)
        *   SSM (S,G)
    *   IPv4 & IPv6

WWW: https://github.com/troglobit/mcjoin